Open AccessBroadband and wide-angle light absorption of organic solar cells based on multiple-depths metal grating
Author(s) -
Xin Liu,
Dan Wang,
Yibiao Yang,
Zhihui Chen,
Hongming Fei,
Binzhao Cao,
Mingda Zhang,
Yanxia Cui,
Yuying Hao,
Aoqun Jian
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.00a596
Subject(s) - materials science , grating , optics , absorption (acoustics) , optoelectronics , polarization (electrochemistry) , surface plasmon , guided mode resonance , surface plasmon resonance , visible spectrum , diffraction grating , plasmon , nanoparticle , nanotechnology , chemistry , physics , composite material
A silver grating containing three grooves with different depths in one period was proposed as the back electrode for improving light absorption in organic solar cells. We found that the broadband absorption enhancement of the active layer covering the visible and near-infrared bands can be obtained due to the excitation of surface plasmon resonance and the multiple resonances of cavity mode. The integrated absorption efficiency of the proposed structure under TM polarization between 350 nm to 900 nm is 57.4%, with consideration of the weight of AM 1.5G solar spectrum, and is increased by 13.4% with respect to the equivalent planar device. Besides, the wide-angle absorption in proposed structure can be observed in the range from 0 to 50 degrees. These findings are of great importance for rationally designing composite nanostructures of metal gratings-based absorbers for sensing and photon-detecting applications.